221_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

# 221_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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SECTION 2.8 Impact Loading 215 Problem 2.8-5 Solve the preceding problem if the block weighs W 1.0 lb, h 12 in., and k 0.5 lb/in. W 1.0 lb h 12 in. k 0.5 lb/in. (a) M AXIMUM SHORTENING OF THE SPRING (b) I MPACT FACTOR (E Q . 2-61) ; 4.6 Impact factor d max d st 9.21 in. 2.0 in. ; 9.21 in. Eq. (2-53): d max d st c 1 + a 1 + 2 h d st b 1/2 d d st W k 1.0 lb 0.5 lb/in. 2.0 in. Solution 2.8-5 Block dropping onto a spring Problem 2.8-6 A small rubber ball (weight W 450 mN) is attached by a rubber cord to a wood paddle (see figure). The natural length of the cord is L 0 200 mm, its cross- sectional area is A 1.6 mm 2 , and its modulus of elasticity is E 2.0 MPa. After being struck by the paddle, the ball stretches the cord to a total length L 1 900 mm. What was the velocity v of the ball when it left the paddle? (Assume linearly elastic

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